کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1328625 | 1499952 | 2005 | 9 صفحه PDF | دانلود رایگان |

This investigation attempts to elucidate the copolymerization reaction ethylene and p-methylstyrene via the homogeneous metallocene catalyst, Et(Ind)2ZrCl2. With increasing of p-methylstyrene concentration, the poly[ethylene-co-(p-methylstyrene)] copolymer shows systematical decrease of melting temperature and crystallinity and increase of glass transition temperature. The benzylic protons of p-methylstyrene are ready for numerous chemical reactions, such as halogenation and oxidation, which can introduce functional groups at the p-methyl group position under mild reaction conditions. With the bromination reaction of poly[ethylene-co-(p-methylstyrene)], polyethylene graft copolymers, such as polyethylene-g-poly(methyl methacrylate) and polyethylene-g-polystyrene can be prepared via atomic transfer radical polymerization. The following selective bromination reaction of p-methylstyrene units in the copolymer and the subsequent radical graft-from polymerization were effective methods of producing polymeric side chains with well-defined structure. The products were characterized by nuclear magnetic resonance, gel-permeation chromatography, differential scanning calorimetry, and thermal gravimetric analysis. Additionally, the morphology of PE/PMMA and PE/PMMA/PE-g-PMMA blend are compared by using scanning electron microscope.
This investigation attempts to elucidate the copolymerization reaction ethylene and p-methylstyrene (MS) via the homogeneous metallocene catalyst, Et(Ind)2ZrCl2. With increasing of p-methylstyrene concentration, the poly(ethylene-co-p-methylstyrene) copolymer shows systematical decrease of melting temperature and crystallinity and increase of glass transition temperature. With the bromination reaction of poly(ethylene-co-p-methylstyrene), polyethylene graft copolymers can be prepared via atomic transfer radical polymerization.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 690, Issue 26, 15 December 2005, Pages 6300–6308